State Fire Marshalls are sworn members of the Maryland State Police. Although they generally operate with cell phones, their vehicles are equipped with MSP low band mobiles, and would communicate with whichever barrack they are operating near when necessary. Coordination (dispatch) of the on-duty and on-call FM is handled by the MEMA Joint Ops Center over the phone.
Nate, I hope I did you proud, and all of that was accurate!